关于javascript:Javascript-补全数字占位

代码如下：

function GetFullNumber(num, length) {
    var maxNumber = 1;
    for (var i = 1; i < length; i++) {maxNumber *= 10;}
    maxNumber = maxNumber.toString();
    num = num.toString();
    var startLength = num.length;
    if (num.indexOf(".") >= 0) {startLength = num.substring(0, num.indexOf(".")).length;
    }
    for (var i = startLength; i < maxNumber.length; i++) {num = "0" + num;}
    return num;
}

比方 GetFullNumber(9, 2) 返回 “09”，办法反对小数。